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Income taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Sep. 30, 2015
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Components of deferred tax assets and liabilities |  |
Costs deductible in future periods | $ 27,738 | $ 25,896
Deferred revenue | 23,469 | 21,446
Stock compensation | 5,085 | 4,600
Net operating loss carryforwards | 1,291 | 1,356
Amortization of goodwill and intangible assets | 34,484 | 22,061
Capitalized software | 10,126 | 9,781
Accounts receivable - unbilled | 13,810 | 9,598
Property and equipment | 5,517 | 6,650
Other | 1,815 | 696
Deferred tax assets, net | $ (8,169) | $ 4,512

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- Definition The current portion of the amount as of the balance sheet date of the estimated future tax effects attributable to the difference between the tax basis of unbilled receivables and the basis of unbilled receivables determined in accordance with generally accepted accounting principles. + References No definition available. + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from deferred income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=68052875&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32632-109319 + Details
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- Definition Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319 + Details
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